Cylinder cup



Aug. 10,1926. 1,595,610

H. E. MAYNARD CYLINDER CUP Filed Oct. 17. 1925 How/W0 E Nay/mm? Patented Aug. 10, 1926.

UNITED STATES HOWARD E. MAYNARD, OF DETROIT, MICHIGAN, ASSIGNOB TO CHRYSLER CORPORA- T1011, 0] DETROIT, MICHIGAN, A. CORPORATION OF DELAWARE.

CYLINDER CUP.

Application med October 17, 1925. Serial No. 63,148.

My invention relates to cups such as are usually made of rubber or similar maternal and used in connection with the pistons 1n the cylinders of hydraulic braking systems to prevent the escape of fluid from the brake cylinder.

It is the primary object of my invention to provide means for stiffening the cup and press it outwardly against the sides of the cylinder wall.

It is a still further object of my invention to so arrange the stiffening means that they will cause the cup to flare outwardly at one end thereof so that the edge of the cup will bear against the cylinder wall with greater force than any of the remainder of the cup.

WVith the above and other objects in view, my invention consists in the arrangement, combination and construction of the various parts of my improved device as. described in the specification, claimed in my claims and shown in the accompanying drawings, in which:

Fig. 1 is a central sectional view of a cup illustrating one form of stiffening means employed therewith.

Fig. 2 is a top or plan view of the stiffening member shown in Fig. 1.

Fig. 3 is a sectional view of a cup showing a modified form of stifl'ening means.

Fig. 4 is a plan view of the stiffening member shown in Fig. 3.

Fig. 5 is a plan view of another modified form of stiffening member.

I have shown a conventional cup such as is used on the cylinder of hydraulic brak ing apparatus consisting of a bottom or base 5 in which the attaching member 6 is ositioned and a circular flanged portion extgending at right angles to the bottom or ase.

It will be noted that the portion 7 is cut away as at 8 to form a circular recess.

As shown in Figs- 1 and 2, a stifiening member consisting of a metallic plate 9 having a convex portion seated on the raised portion 10 of the cup bottom- 5 is provided with a plurality of separated fingers 11 extending substantially parallel with the portion 7 of the cup and enga ing under tension in the recess 8. The fingers '11 being under: tension act as spring fingers to. force thew-forward edge of the: portion 7 outwardly. :By'-reason ofthe': fact that'the' recess 8 is tapered from the bottom thereof toward the bottom 5, but extends at right angles to the portion 7 on the edge farthest removed from the bottom 5, the outward pressure of the fingers 11 will tend to exert force on the straight edge of the cut out portion so as to force the edge 12 of the cup outwardly to a greater extent than any other portion of the cup. Inasmuch as the edge 12 of the cup forms the most efiicient sealmg portion of the cup, it is highly desirable that such pressure be exerted at this polnt, instead of straight out on the cup at the portion thereof where the ends of the fingers are positioned.

, In the modified form of my improved device as shown in Figs. 3 and 4 I utilize a coiled spring 13 seated in the recess 8 instead of the flanged plate or washer 9. The same principle of exerting pressure to secure the greatest pressure point on the edge 12 is employed as in the construction 1n Figs. 1 and 2.

In the modified form shown in Fig. 5 I employ a single piece of wire of circular formation having the portions 14 adapted to bear in the out out portion 8 and depressed portions 15 adapted to lend a springlike action to the member. This form operates to exert pressure as to the other two forms. v

It will be obvious that 'various changes may. be made in the arrangement combination and construction of the various parts of my improved device without departing from the spirit of my invention, and it is my intention to cover by my claims such changes as may be reasonably included within the scope thereof.

What I claim is:

1.. A flexible cup having a groove adjacent the free edge of the sidewall thereof, that portion of the groove nearest the edge extending substantially at right angles to the side wall and that portion farthest removed from the free edge extending at substantiall less than right angles from said side wal and means in said groove exerting pressure on both walls of said groove.

2. A flexible cup having a groove adjacent the free edge of the side wall thereof, that portion of the groove nearest the edge extending substantially at right angles to the side wall and that portion farthest-removed from the free edge extending at substantiall less than right angles from said extending substantially at right angles to side wa and means in said groove exert the side wall and that portion farthest re- 10 pressure on both walls of said groove, sai moved from the free ed e extending at submeans consisting of a wire compressed in stantially less than rig t angles from saidi the groove. side wall, and means 1n said groove exert- 3. A flexible cup having a groove adjaing pressure on both walls of'said groove, cent the free edge of the side wall thereof, sa1d means consisting of a coiled spring. that portion of the groove nearest the edge HOWARD E, MAYNARD 

